This is odd (and totally minor) but when I run The Legend (VST or AU, 64bit, Mac, Ableton) there are these weird pink lines on the text in the preset window (see attached screenshot). Anyone else have this?

You do not have the required permissions to view the files attached to this post.

So a Retina Monitor isn't just higher resolution like 4K ? Is it higher pixel density or what makes a Retina display special ? Is there a Windows equivalent and if not why not ? It seems to this casual observer that Macs are a pain to support...

Yes. "Retina Display" is just Apple's marketing term for a high pixel density display like a 4k laptop screen, which you could never use with 100% scaling. It's basically a con job because before "Retina" displays I never heard anyone complaining that they could see the pixels in their screen. Nobody. Ever. It doesn't make anything look better, it just sucks up twice as much power. At work some of our MacPros have 4k screens and they don't look any better than the older Apple Cinema displays, especially if you run them at the same resolution. TO be fair, most of that is down to the older displays have glossy screens, which make blacks look a lot darker, but they still look better.

My point is that it doesn't show up in a screen shot so it's very specifically a display issue, not an issue with Legend. i.e. The computer is sending the correct image to the display but the display is showing it incorrectly. Playing with the display settings might, therefore, solve the problem.